Rollup merge of #57466 - king6cong:comment, r=alexcrichton
Rollup merge of #57466 - king6cong:comment, r=alexcrichton

Remove outdated comment

More here: https://github.com/rust-lang/rustc-guide/pull/261

aidancully/rust,graydon/rust,aidancully/rust,aidancully/rust,graydon/rust,graydon/rust,graydon/rust,graydon/rust,aidancully/rust,aidancully/rust,aidancully/rust,graydon/rust